An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is. a. 2 b. 4 c. 3 d. 1
option A. An element belong to period 2 and group 2 the number of valence electrons in the atoms of this elements is 2. Explanation: It is known that group of an atom tells the number of valence electrons holded by an atom. On the other hand, period number tells the number of shells present in an atom.
